@freckle/resource-status
v1.0.1
Published
ResourceStatusT type and utilities
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Resource Status
Defines the ResourceStatusT
type and utilities operating on this type.
Install
yarn add @freckle/resource-status
Versioning and release process
See RELEASE.md.
ResourceStatusT<R>
Wraps data from a resource R
with metadata to describe the status of accessing
and updating the data. The status
field can be used to react accordingly:
type Props = {resource: ResourceStatusT<{username: string}>}
const UserView = ({resource}: Props) => {
switch (resource.status) {
case 'idle':
return <p>User has not been loaded</p>
case 'loading':
return <p>Loading user</p>
case 'reloading':
return <p>User: {resource.data.username} (reloading)</p>
case 'error':
return (
<p>
Error loading user: <pre>{JSON.stringify(resource.error)}</pre>
</p>
)
case 'complete':
return <p>User: {resource.data.username}</p>
case 'updating':
return <p>User: {resource.data.username} (pending update)</p>
case 'updating-error':
return (
<p>
Error updating user {resource.data.username}: <pre>{JSON.stringify(resource.error)}</pre>
</p>
)
default:
return exhaustive(resource)
}
}
Utilities
Utilities are defined to make operating on a resource status.
maybeResourceData(resource)
Returns the underlying resource.data
if it exists.
fromMaybeResourceData(resource, default)
Returns the underlying resource.data
if it exists, or default
otherwise.
isFetching(resource)
Returns true
when a resource
is loading or reloading.
updateResource(resource, updateFn)
Performs updateFn(resource.data)
if there exists data in the resource, and
returns a new resource
. This is convenient for reducer-style updates:
type State = ResourceStatusT<{username: string; token: string}>
type Action =
| {type: 'USER_UPDATE_REQUEST'}
| {type: 'USER_UPDATE_RESPONSE'; data: {username: string}}
const reducer = (state: State, action: Action) => {
switch (action.type) {
case 'USER_UPDATE_REQUEST':
// ...
case 'USER_UPDATE_RESPONSE':
return updateResource(state, user => ({
...user,
username: action.data.username
}))
}
}